Lithium can refer to:

• Lithium, chemical element
• Lithium ion battery, battery for electronics
• Category:Lithium compounds discusses chemical properties of lithium salts
• Lithium pharmacology discusses use of lithium ion and salts as mood-stabilizing drugs
• Lithium, Missouri
• "Lithium", a song by Nirvana
• "Lithium Flower" is a song composed by Yoko Kanno and sung by Scott Matthew
• Dilithium and Trilithium are fictional compounds from Star Trek
• Lithium Internet forums